LM5116
SNVS499G –FEBRUARY 2007–REVISED MARCH 2013
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Electrical Characteristics (continued)
Limits in standard type are for TJ = 25°C only; limits in boldface type apply over the junction temperature range of -40°C to
+125°C and are provided for reference only. Unless otherwise specified, the following conditions apply: VIN = 48V, VCC =
7.4V, VCCX = 0V, EN = 5V, RT = 16 kΩ, no load on LO and HO.
Symbol
PWM Comparators
tHO(OFF)
Parameter
Conditions
Min
Typ
Max
Units
Forced HO Off-time
320
450
100
580
ns
ns
tON(min)
Minimum HO On-time
VIN = 80V, CRAMP = 50 pF
Oscillator
fSW1
Frequency 1
RT = 16 kΩ
RT = 5 kΩ
180
480
200
535
220
590
kHz
kHz
V
fSW2
Frequency 2
RT output voltage
RT sync positive threshold
1.191
3.0
1.215
3.5
1.239
4.0
V
Current Limit
Cycle-by-cycle Sense Voltage Threshold
(CSG - CS)
VCS(TH)
VCCX = 0V, RAMP = 0V
VCCX = 5V, RAMP = 0V
94
110
122
126
139
mV
mV
Cycle-by-cycle Sense Voltage Threshold
(CSG - CS)
VCS(THX)
105
-1
CS Bias Current
CS Bias Current
CSG Bias Current
CS = 100V
CS = 0V
1
µA
µA
µA
90
90
125
125
CSG = 0V
RT = 16 kΩ, (200 kHz), (256
clock cycles)
Current Limit Fault Timer
1.28
ms
RAMP Generator
IR1
IR2
RAMP Current 1
VIN = 60V, VOUT=10V
VIN = 10V, VOUT = 10V
VOUT = 36V
235
21
285
28
335
35
µA
µA
µA
mV
RAMP Current 2
VOUT Bias Current
RAMP Output Low Voltage
200
265
VIN = 60V, VOUT = 10V
Diode Emulation
SW Zero Cross Threshold
DEMB Output Current
DEMB Output Current
-6
2.7
38
mV
µA
µA
DEMB = 0V, SS = 1.25V
DEMB =0V, SS = 2.8V
1.6
28
3.8
48
DEMB = 0V, SS = Regulated
by FB
DEMB Output Current
45
65
85
µA
LO Gate Driver
VOLL
LO Low-state Output Voltage
LO High-state Output Voltage
ILO = 100 mA
0.08
0.25
0.17
V
V
ILO = -100 mA, VOHL = VCC
VLO
-
VOHL
LO Rise Time
C-load = 1000 pF
C-load = 1000 pF
VLO = 0V
18
12
ns
ns
A
LO Fall Time
IOHL
IOLL
Peak LO Source Current
Peak LO Sink Current
1.8
3.5
VLO = VCC
A
HO Gate Driver
VOLH
HO Low-state Output Voltage
HO High-state Output Voltage
IHO = 100 mA
0.17
0.45
0.27
V
V
IHO = -100 mA, VOHH = VHB
VHO
–
VOHH
HO Rise Time
C-load = 1000 pF
C-load = 1000 pF
VHO = 0V
19
13
1
ns
ns
A
HO High-side Fall Time
Peak HO Source Current
Peak HO Sink Current
HB to SW under-voltage
IOHH
IOLH
VHO = VCC
2.2
3
A
V
6
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